本帖最后由 MaJiang 于 2011-3-28 23:29 编辑
老秋还是不够严谨。不过大概意思是到了。
做核弹的是plutonium-239, 半衰期是两万4千年。一磅plutonium进入大气再进入人的呼吸道大概可以kill 几百万人。谁知道小日本到底藏了多少plutonium在三号堆？
Plutonium is the heaviest primordial element, by virtue of its most stable isotope, plutonium-244, whose half-life of about 80 million years is just long enough for the element to be found in trace quantities in nature.[3] The most important isotope of plutonium is plutonium-239, with a half-life of 24,100 years. Plutonium-239 is the isotope most useful for nuclear weapons. Plutonium-239 and 241 are fissile, meaning the nuclei of their atoms can break apart by being bombarded by slow moving thermal neutrons, releasing energy, gamma radiation and more neutrons. These can therefore sustain a nuclear chain reaction, leading to applications in nuclear weapons and nuclear reactors.
A commonly cited quote by Ralph Nader, states that a pound of plutonium dust spread into the atmosphere would be enough to kill 8 billion people. However, the math shows that only up to 2 million people can be killed by inhaling plutonium. This makes the toxicity of plutonium roughly equivalent with that of nerve gas. [93] |
发表于 2011-3-28 23:27
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